<form th:action="@{/user/register}" method="post">
    用户名：<input type="text" name="userName"/><br/>
    密码：<input type="password" name = "password"/><br>
    生日：<input type="date" name="birthday" value=""><br/>
    <button type="submit">提交</button>
    <button type="reset">重置</button>
</form>

@PostMapping(value = "/register")
public ModelAndView register(User user){
    System.out.println(user.getUserName());
    System.out.println(user.getPassword());
    System.out.println(user.getBirthday());
    ModelAndView modelAndView = new ModelAndView();
    //给request对象设置一个属性
    modelAndView.addObject("userName","Tiger");
    //设置跳转的视图
    modelAndView.setViewName("success");
    return modelAndView;
}

package com.hqyj.springmvc.common;
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class StringDateConverter implements Converter<String, Date> {
    public Date convert(String source) {
        String format = "yyyy-MM-dd";
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
        Date parse = null;
        try {
            parse = simpleDateFormat.parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parse;
    }
}

<mvc:annotation-driven conversion-service="conversionService"/>
<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <bean class="com.hqyj.springmvc.common.StringDateConverter"/>
        </set>
    </property>
</bean>